GCN Circular 24219
Subject
LIGO/Virgo S190425z : IRSF/SIRIUS NIR photometry of ZTF19aarykkb and ZTF19aarzaod
Date
2019-04-26T11:27:51Z (5 years ago)
From
Kumiko Morihana at Nagoya University <morihana@u.phys.nagoya-u.ac.jp>
K. Morihana (Nagoya Univ.), M. Jian (Univ. of Tokyo), T. Nagayama (Kagoshima Univ.)
report on behalf of J-GEM collaboration:
We observed ZTF19aarykkb and ZTF19aarzaod reported by the Zwicky Transient Facility
(Kasliwal et al., GCN 24191) with the near-infrared (J, H, Ks) simultaneous imaging camera SIRIUS
attached to 1.4 m telescope IRSF (InfraRed Survey Facility) in Sutherland observatory, South Africa.
The observation started on 2019-04-26 00:19:13 UT. The exposure times in J-, H-, Ks-bands are
~30min (ZTF19aarykkb) and ~40 min (ZTF19aarzaod), respectively. We performed aperture photometry
and the magnitude are listed below. The photometric magnitudes may have an effect from the host
galaxy and nearest stars.
Target UTC J (err) H (err) Ks (err)
---------------------------------------------------------------------------------------------------
ZTF19aarykkb 2019-04-26 00:36:51.7 16.8 (0.1) 16.4 (0.1) 16.1 (0.1)
ZTF19aarzaod 2019-04-26 01:25:52.9 17.4 (0.1) 16.7 (0.1) 16.4 (0.1)
---------------------------------------------------------------------------------------------------
Given magnitudes were calibrated against 2MASS point sources (Vega System) in the field.